In this version of Torque3D MIT (v3.6.1) there is still the problem of aircraft getting stuck in terrain or other objects.
such as when you land an aircraft at low speeds and it slowly drifts into a wall and "Gets Stuck".

These code tweaks will help to automatically "UNSTICK" your stuck aircraft.

because it tends to occur with only flying vehicles, adding in
if (%obj.getClassName() == "FlyingVehcile")
will make it apply only to flying vehicles.
%this.CheckForStuck(%obj);
is the call that will start it's routine checking for getting stuck, and pushing the vehicle back when a sticky situation is detected.

taming the collisions between vehicles and terrain in T3D can be a downward spiral. The same problems affect space, water, hover and vtol vehicles as well - adding this change to vehicle.cpp around line 1212 solves most of these issues: